[Equest-users] NECB 2015 Question

[Benjamin Zizi]

Good morning,

That would be my interpretation too. It differs if it is more or less than
the maximum permitted and should be adjusted for the reference as maximum
permitted.This approach is different than with ASHRAE 90.1 and gives a
significant advantage to projects with less windows than usual (which is a
good thing). Same approach is taken with Energuide ratings : HOT2000
software adjust the ratio of reference building as soon as the proposed
building is outside the minimum and maximum ranges : 17% - 22%.

This interpretation would also be confirmed by the LEED V4 Canadian ACP (
https://www.cagbc.org/cagbcdocs/leed/LEED_v4_Canadian_ACP_Language_as_of_20170420.pdf)
that states that projects can use the NECB reference at some conditions,
including :

*Apply fenestration area convention similar to ASHRAE 90.1-2010 *
Maintain the same FWR (as defined by NECB, including doors) for the
Reference as exists in the Proposed Design, up to the prescribed maximum.
If the Proposed Design’s FWR exceeds the prescribed FWR, scale down the
fenestrations in the Reference case accordingly.


However, NECB is quite unclear on this topic and it could be good to have
an official guidance :)

Benjamin Zizi
Coordonnateur technique

Évaluateur écologique et énergétique LEED Habitations


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Le jeu. 14 mars 2019 à 09:58, Kyle Anders via Equest-users <
equest-users at lists.onebuilding.org> a écrit :

> That's my interpretation, although I know of at least one local code
> (Ontario's SB-10) that has modified this:
>
> [image: image.png]
>
> On Thu, Mar 14, 2019 at 9:46 AM Chris Hadlock via Equest-users <
> equest-users at lists.onebuilding.org> wrote:
>
>> Good morning,
>>
>> This is a question for my follow Canadians that have experience with the
>> NECB 2015 code.
>>
>> What is everyone's take on what fenestration area to model for the
>> reference model when the Proposed model area is less than the maximum
>> permitted?
>>
>> Specifically, I'm referring to Part 8.4.4.3.3) which states "If the total
>> vertical fenestration and door area to gross wall area (FDWR) of the
>> proposed building differs from the maximum permitted by Article 3.2.1.1.,
>> the FDWR of the reference building shall be adjusted proportionally along
>> each orientation until it complies with that Article."
>>
>> Do people interpret this as if my Proposed FDWR is say 20%, then my
>> Reference FDWR is to be increased to say 40% (based on a Zone 5 climate)?
>>
>> Thanks,
>> Chris
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>
>
> --
> Kind Regards,
>
> *KYLE ANDERS*, MASc, NRCan EA, LEED for Homes Green Rater
>
> *Senior Project Manager*
>
> *T* | 1-800-267-6830 x180   *C* | 226-220-2391
> *F* | 519-658-6103               *E* | kyle at buildingknowledge.ca
>
>
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